Should I go for B.Tech (CSE) leaving B.Sc honors in CS and lose 1 year?

Yes, you can go as you will have much better career options after B.Tech (CSE).

Yes You can join B.Tech CSE as this stream has great career scope. B.Tech CSE is the most popular course among the students. After the completion of your degree in Computer Science Engineering, you can work in the field of database management, embedded systems, IT, telecommunication, multimedia, com

Obviously, since you are doing B.Sc in CS you won't have much opportunity in other Masters fields that a B.Sc. Physics or Chemistry or mathematics or Statistics student may avail, the road and options ahead of you is same as the plenty of CSE and IT engineers in case of India. Hope it helps.

Which is better. B.Sc in computer Science or B.Tech in computer Science. B.Sc Computer Science is 3 years of Graduation course while B.Tech is 4 years of Graduation course after which you will get Engineer's Degree. B.Sc. CS will teach you about computer application but won't focus much on coding.

If you are looking for better job opportunity then you have to take this hard decision and I suggest you to visit the link from here to get aware of the career prospects of different programs https://www.shiksha.com/university/university-of-engineering-and-management-kolkata-47398/courses/it-and-sof

Dear friend according to my views and personal experience, you should not leave B.Sc Hons in CS because, it has good subject, where you will get good scopes. So, continue your line, and you can go in teaching line.

Yes, you should opt for that as it will give you more career opportunities.